JP4044757B2 - Variable lever tumbler lock - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a variable lever tumbler lock, and more particularly to a novel variable lever tumbler lock that can easily change the key difference with a simple operation.
[0002]
[Prior art]
As shown in FIGS. 1 and 2, the lever tumbler lock has an outer cylinder 2 in which a cam groove 1 is formed along a generatrix of the inner peripheral surface, and is rotatably fitted to the outer cylinder and is centered through a gap. A plurality of partition plates 3 and 3 stacked in the axial direction are provided, an inner cylinder 5 penetrating the key hole 4 along the central axis, and extending along a generatrix of the inner cylinder 5, It has a locking bar 6 that is guided so as to be movable in the radial direction at the outer peripheral portion, and whose outer edge engaged with the cam groove 1 is urged in the outward projecting direction.
[0003]
Further, each slot 7 between the partition plates is substantially C-shaped as a whole and is pivotally supported at one end so as to be swingable, and is urged in a direction that interferes with the side edge of the key inserted into the key hole. At the same time, a lever tumbler 11 that is locked to a backup pin 8 that penetrates the inner cylinder in the axial direction and that has an unlocking notch 9 that receives the inner edge of the locking bar 6 at the outer edge of the free end is inserted. ing.
[0004]
When each of these tumbler groups is engaged with the corresponding keyway of the key inserted through the key hole, the unlocking notch 9 of each lever tumbler 11 is aligned with the inner edge of the locking bar 6 (not shown). ) Is configured as follows.
[0005]
Therefore, when the key is inserted into the key hole 4 and the inner cylinder 5 is relatively rotated in the outer cylinder 2, the inner cylinder of the locking bar 6 is caused by the wedge action generated between the cam groove 1 and the locking bar 6. In other words, the lever tumbler lock is unlocked and the inner cylinder 5 rotates in the unlocking direction.
[0006]
In FIGS. 1 and 2, reference numeral 12 denotes a support shaft that penetrates one end of the lever tumblers 11 and 11 in common and rotatably supports them.
[0007]
[Problems to be solved by the invention]
The lever tumbler lock having the above-described configuration is becoming mainstream before the locks of dwelling units because of the certainty of operation and excellent usability.
[0008]
On the other hand, the same applies to other types of locks, such as pin tumbler locks and disc tumbler locks, but the tumbler shape and the depth of the keyway of the corresponding key are mechanically determined. There remains a grudge that it cannot be changed.
[0009]
Therefore, for example, when the resident of an apartment or an apartment changes, if the previous resident makes a spare key for the combined key, it is clear that the security of the lock is impaired.
[0010]
However, it is well known that if the occupant of the rented room changes or the key is lost, it will not be done in practice because it will be cumbersome and expensive to replace the lock each time. is there.
[0011]
Accordingly, an object of the present invention is to provide a novel variable lever tumbler lock that can change the key difference with a simple operation when, for example, the occupant of the rental room changes.
[0012]
[Means for Solving the Problems]
In order to achieve the above object, the present invention includes an outer cylinder in which a cam groove is formed along a generatrix of an inner peripheral surface, and a rotary fitting fitted to the outer cylinder so that a key hole passes through a central axis. The inner cylinder and a direction that extends along the generatrix of the inner cylinder, is guided in a radially movable manner at the outer peripheral portion of the inner cylinder, and the outer edge that engages with the cam groove projects outward A locking bar urged to the side of the key, the overall shape of each of the inner cylinders being substantially C-shaped, and pivotally supported by one end of the pivot so as to be swingable. It is urged in the direction that interferes with the edge, and is normally locked to a backup pin that penetrates the inner cylinder in the axial direction, and an unlocking notch is formed on the outer edge of the free end to receive the inner edge of the locking bar. A plurality of lever tumblers are arranged along the keyhole, and each of these tumbler groups is placed in the keyhole. When engaged with a corresponding keyway of the passed duplicate key, in which unlocking notch of each lever tumbler is so aligned with the inner edge of the locking bar,
Each lever tumbler is a combination of a tumbler A and a tumbler B that overlap each other in a substantially C shape, and is supported so that it can rotate around the axis of an eccentric shaft that projects from both ends of the support shaft. The tumbler A, one end of which is loosely fitted to the support shaft, is formed with an engaging portion with the key groove of the key, and is biased in a direction that interferes with the key, and one end is rotated about the support shaft. Forming the unlocked notch on the outer edge of the free end portion of the tumbler B that is freely fitted, and forming the portion that overlaps with the engaging portion with the key side edge of the tumbler A so as not to interfere with the key, On the other hand, an engagement protrusion is provided on the inner edge of the tumbler A on the side facing the tumbler B, and an engagement protrusion of the tumbler A is formed on the inner edge of the tumbler B on an arc centering on the support shaft. A plurality of engaging recesses that can be engaged with each other, and When the engaging portion of the tumbler A is engaged with a plurality of types of key grooves formed at the side edge of the key, the angled position is set so as to be aligned with the engaging protrusion, The switch shaft is urged outward, and a switch member that can be moved in the radial direction of the inner cylinder and can be operated from the outside is provided at the inner end of the inner cylinder so as to be able to come into contact with it from the outside of the spindle. It is characterized by that.
[0013]
【Example】
An embodiment of the present invention will be described below with reference to FIGS.
The characteristic configuration of the present invention is that each of the lever tumblers 11 is not a single member but is divided into two members, a tumbler A11A and a tumbler B11B, as shown in FIG.
[0014]
The tumbler A11A and the tumbler B11B are plate-like bodies each having a substantially C-shape, and one end (the upper end in FIG. 3) is pivotally supported by the support shaft 12 in a state where they overlap each other. Yes.
[0015]
On the other hand, as shown in FIG. 4, eccentric shafts 13 and 13 (the illustration of the eccentric shaft at the inner end is omitted in FIG. 4) are provided at both ends of the support shaft 12, respectively. As shown in FIG. 5, these eccentric shafts 13 and 13 are rotatably supported by a key guide 14 and a tail guide 15, respectively.
[0016]
Since the eccentric shaft 13 and the support shaft 12 are eccentric, in other words, the support shaft 12 and the central axis c of the eccentric shaft 13 shown in FIG. 3 are not coaxial. When the upper end of the cross section is pushed in the direction of the arrow, the support shaft 12 rotates about the center axis c of the eccentric shaft.
[0017]
That is, the cross section of the support shaft 12 shown in FIG.
[0018]
In FIG. 3, the cross-sectional shape of the eccentric shaft 13 is not a perfect circle, but a part of the eccentric shaft 13 is scraped by the outer peripheral surface of the support shaft 12. This is because the distance from the center axis c of the eccentric shaft is increased, and is not an essential component of the present invention.
[0019]
If the angle at which the central axis c of the eccentric shaft looks at the outer peripheral surface of the eccentric shaft 13 is 180 degrees or more, the support shaft can be smoothly supported even if the eccentric shaft 13 is partially cut away. .
[0020]
On the other hand, as shown in FIG. 3, an engagement portion 16 that engages with a key groove of a not-shown key is formed in the center portion of the side edge facing the key hole 4 of the tumbler A, and a tumbler spring 17 ( The elastic force of FIG. 6) is biased in the direction of interference with the key.
[0021]
The manner in which the tumbler spring 17 is attached to the tumbler A is the same as that of the conventional lever tumbler lock, and thus a more detailed description is omitted.
[0022]
On the other hand, the unlocking notch 9 is formed on the outer edge of the free end portion of the tumbler B11B, and the portion overlapping the engaging portion 16 of the tumbler A is formed so as not to interfere with the key. In short, it is cut out.
[0023]
Returning to the description of the tumbler A11A, a thin pin-like engagement protrusion 18 (see FIG. 3) is integrally formed on the inner edge of the free end facing the tumbler B11B.
[0024]
Correspondingly, on the inner edge of the free end of the tumbler B11B, as shown in FIG. 3, on the arc centered on the support shaft 12, for example, corresponding to the depth type of the keyway of the key, for example Four engaging recesses 19, 19 are formed.
[0025]
In the illustrated embodiment, the engagement recess 19 is formed as a U-shaped notch that engages with the engagement protrusion 18.
[0026]
The angular position of each engagement recess 19 with respect to the support shaft 12 is such that the engagement portion 16 of the tumbler A11A has a plurality of types of key grooves (four types in the illustrated embodiment) formed on the side edge of the key. It is set so as to be aligned with the engaging protrusion 19 when engaged.
[0027]
For example, the leftmost engagement concave portion 19 in FIG. 3, that is, the engagement concave portion fitted to the engagement protrusion 18 of the tumbler A11A is related to the formation angle position of the unlocking notch 9. It corresponds to one depth of the groove, and when the key groove of that depth and the engaging portion 16 of the tumbler A11A are engaged, the unlocking notch 9 and the inner edge of the locking bar 6 are aligned. The angular position is determined.
[0028]
Similarly, the angular position of the other engaging recess 19 of the tumbler B11B corresponds to the other depth of the keyway of the key combination.
[0029]
Therefore, when the tumblers A and B11A, 11B are in the positional relationship as shown in FIG. 3 and the engaging protrusion 18 is engaged with one of the engaging recesses 19, 19, the two are integrally connected to each other. It functions as a lever tumbler corresponding to one depth of the keyway.
[0030]
Returning to the description of the support shaft 12, as shown in FIGS. 5 and 7, the support shaft 12 is urged outward (upward in FIG. 7) by the elasticity of the support shaft spring 21 as a torsion coil spring, for example. As a result, a rotational moment about the eccentric shaft 13 is given.
[0031]
Further, in order to define a normal angle position where an external force other than the support shaft spring 21 does not act on the support shaft 12, as shown in FIG. 7, an inclined stop surface 22 is formed on the outer surface side of the tail plug 15, Then, the support shaft 12 is in elastic contact with the inclined stop surface 22 to define the angular position of the support shaft 12 relative to the eccentric shaft 13.
[0032]
This angular position in the illustrated embodiment is an angular position of 10:30 with respect to the eccentric shaft 13 in terms of a clock face.
[0033]
On the other hand, as shown in FIGS. 4 and 5, an inclined surface 25 is formed on the back side in the space defined by the rectangular recessed portion 23 formed on the inner end surface of the outer cylinder 2 and the back plate 24. The block-shaped switch member 26 is guided and accommodated so as to be movable in the radial direction of the outer cylinder.
[0034]
The inner end (the lower end in FIGS. 4 and 5) of the switch member 26 is in contact with the outer peripheral surface of the spacer ring 27 fitted to the inner end portion of the support shaft 12.
[0035]
In FIG. 3, reference numeral 28 denotes a spindle-shaped supporting shaft hole opened at one end of the tumbler A <b> 11 </ b> A, and reference numeral 29 denotes a relief notch formed at the outer edge of the free end of the tumbler A <b> 11 </ b> A.
[0036]
As is apparent from FIG. 3, the escape notch is a notch formed in the tumbler A11A so as not to interfere with the locking bar 6 on the principle of operation of the lever tumbler lock. However, the width of the free end of the tumbler A11A is narrowed. However, if the material is appropriately set so as to ensure the strength, it is not necessary.
[0037]
In the variable tumbler lock according to the embodiment of the present invention configured as described above, the locking bar 6 and the unlocking notch 9 are angularly aligned in the locked state shown in FIG. 6 or in a state where a different key is inserted. Not done.
[0038]
At this time, for example, if the different key is turned to rotate the inner cylinder, the locking bar 6 is displaced from the cam groove 1 due to the wedge action caused by the relative rotation of the inner cylinder with respect to the outer cylinder 2, that is, The locking bar 6 moves through the tumbler B11B and the support shaft 12 to move in the direction of the central axis of the inner cylinder, and the inclined stop surface of the tail plug 15 (usually also formed on the key guide 14). 22 (see FIG. 7), so the inner cylinder cannot be rotated.
[0039]
On the other hand, when the key 29 is inserted into the keyhole, as shown in FIG. 8, for example, the unlocking notch 9 of the tumbler B11B and the inner edge of the locking bar 6 are angularly aligned. The inner cylinder can be turned in the same manner. That is, this variable tumbler lock is unlocked.
[0040]
In order to change the key difference of the variable tumbler lock according to the present invention, as shown in FIG. 8, first, the previous key is inserted into the key hole.
[0041]
Then, the key groove of the key is engaged with the engaging portion 16 of each tumbler 11, and as a result, the unlocking notches 9 and 9 of all the tumblers 11 and 11 are aligned with the inner edge of the locking bar 6.
[0042]
At this time, without pulling out the previous key 29, as shown in FIGS. 9 and 10, for example, the conversion pin 31 whose tip is formed in a conical shape is inserted into the inside from the pin hole 32 (see FIG. 5) of the back plate 24. insert.
[0043]
Then, the switch member 26 moves in the direction of the inner cylinder central axis by the wedge action generated between the inclined surface 25 of the switch member 26 and the tip of the conversion pin 31.
[0044]
The movement of the switch member 26 is transmitted to the support shaft 12 via the spacer ring 27. As a result, the support shaft 12 moves around the central axis of the eccentric shaft 13 as shown in FIG. The tumbler B <b> 11 </ b> B moves outwardly following the support shaft 12.
[0045]
At this time, as shown in FIG. 11, the tumbler A11A keeps its original position by the elasticity of the tumbler spring 17 (see FIG. 6), and the support shaft 12 moves freely in the support shaft hole 28 opened at one end of the tumbler A11A.
[0046]
That is, the tumbler B11B moves relatively downward in FIG. 10 independently of the tumbler A11A, and with this movement, the engaging protrusion 18 of the tumbler A11A is disengaged from the engaging recess 19 that has been engaged so far. To do.
[0047]
At this time, since the unlocking notch 9 of the tumbler B11B is angularly aligned with the inner edge of the locking bar 6 as described above, each tumbler B11B is engaged with the unlocking notch 9 and the inner edge of the locking bar 6. It is possible to move outward without interfering with the rocking bar 6 while increasing the degree of.
[0048]
Next, as shown in FIG. 12, when the key 30 is pulled out with the conversion pin 31 inserted into the outer cylinder, the tumbler B11B is locked to the locking bar 6, and only the tumbler A11A has the elasticity of the tumbler spring. Is rotated counterclockwise and is eventually locked to the backup pin 8.
[0049]
Next, a new key 300 different from the previously extracted key 30 is inserted into the keyhole with the conversion pin 31 inserted into the outer cylinder.
[0050]
Then, as shown in FIG. 13, the engaging portion 16 (see FIG. 3) of each tumbler B <b> 11 </ b> B engages with the corresponding key groove of the new key 300, and the engaging protrusion 18 becomes a new engaging recess. 19 will be engaged.
[0051]
In the illustrated embodiment, the engagement protrusion 18 that has been engaged with the leftmost engagement recess 19 until then (see FIG. 8) is the second engagement recess 19 from the left as shown in FIG. It will be able to engage with.
[0052]
When the conversion pin 31 is removed from the pin hole of the outer cylinder in this state, as shown in FIG. 14, the support shaft 12 moves upward by the elasticity of the support shaft spring 21 (see FIG. 7), and is driven by this. All the tumblers B11B move upward, and all the engaging protrusions 18 engage with the new engaging recess 19 corresponding to the new key 300.
[0053]
Thereafter, the conventional key 30 can no longer be used, and the lever tumbler lock can be locked and unlocked only by the new key 300. That is, the key difference is changed.
[0054]
If the above operation is repeated, the key difference can be changed any number of times as long as a new key can be prepared.
[0055]
In the illustrated embodiment, the switch member 26 is moved up and down by the conversion pin. However, for example, this can be configured such that the switch member is directly driven by fingers, and other drive members. A plurality of types of configurations can be considered.
[0056]
【The invention's effect】
As apparent from the above description, the present invention divides the lever tumbler into the tumbler A and the tumbler B, the tumbler A has an engaging protrusion, and the tumbler B has a plurality of keyholes corresponding to the depth of the keyway. Each of the engaging recesses is formed and moved in the radial direction using the pivot of the support shaft eccentric to the tumbler B, and the engaging recesses corresponding to the depth of the key groove of the new key inserted into the key hole Since the angle of the unlocking notch with respect to the support shaft is changed by changing the mode of engagement with the engaging protrusion, the expected effect is that the key difference can be changed any number of times with a simple operation. Play.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an example of a conventional lever tumbler lock.
FIG. 2 is a cross-sectional view thereof.
FIG. 3 is an enlarged front view for explaining the structure of a tumbler of a lever tumbler lock according to an embodiment of the present invention, showing a state in which tumblers A and B are connected to each other.
FIG. 4 is an enlarged external perspective view showing a driving mechanism of a support shaft by a switch member, and shows a normal state.
FIG. 5 is an enlarged longitudinal sectional view of a lever tumbler lock according to one embodiment of the present invention.
FIG. 6 is an enlarged cross-sectional view seen from the outside.
FIG. 7 is an enlarged front view of the tail plug as seen from the outside.
FIG. 8 is a cross-sectional view for explaining the key difference conversion of the lever tumbler lock according to the present invention, and shows one key difference corresponding to one key.
FIG. 9 is a cross-sectional view for explaining the key difference conversion of the lever tumbler lock according to the present invention, and shows a state in which the tumblers A and B are separated by driving the heel switch member in which one key is inserted into the key hole. Show.
10 is an enlarged external perspective view showing a driving mechanism of a support shaft by a switch member similar to FIG. 4, and shows a state in which the switch member is driven by a conversion pin.
11 is an enlarged front view for explaining the structure of a tumbler similar to that in FIG. 3, and shows a state where tumblers A and B are separated for key difference conversion.
FIG. 12 is a cross-sectional view for explaining the key difference conversion of the lever tumbler lock according to the present invention, in which the switch member is driven to separate the tumblers A and B and then the one key is removed from the keyhole. Show.
FIG. 13 is a cross-sectional view for explaining the key difference conversion of the lever tumbler lock according to the present invention. After separating the tumblers A and B by driving the switch member, one key is removed from the key hole, The state in which the key is inserted into the keyhole is shown.
FIG. 14 is a cross-sectional view for explaining the key difference conversion of the lever tumbler lock according to the present invention, and shows a state where a new key difference is fixed by inserting the other key into the key hole and then returning the switch member to the original position. Show.
[Explanation of symbols]
1 Cam groove 2 Outer cylinder 4 Key hole 5 Inner cylinder 6 Locking bar 8 Backup pin 9 Unlock notch 11 Lever tumbler 11A Tumbler A
11B Tumbler B
12 Support shaft 13 Eccentric shaft 14 Key guide 15 Tail plug 16 Engagement portion 17 Tumbler spring 18 Engagement projection portion 19 Engagement recess portion 21 Support shaft spring 22 Inclination stop surface 25 Inclination surface 26 Switch member 30 Key 31 Conversion pin

Claims (1)

An outer cylinder in which a cam groove is formed along the generatrix of the inner peripheral surface, an inner cylinder that is rotatably fitted to the outer cylinder and penetrates the key hole along the central axis, and along the generatrix of the inner cylinder A locking bar that is guided in a radially movable manner at the outer peripheral portion of the inner cylinder and that is biased in a direction in which an outer edge engaged with the cam groove protrudes outwardly, Each of the inner cylinders is substantially C-shaped, and is pivotally supported with one end pivotably supported by a support shaft. The inner cylinder is urged in a direction that interferes with the side edge of the key combination inserted into the key hole. In a normal state, a plurality of lever tumblers that are locked by a backup pin that penetrates the inner cylinder in the axial direction and that has an unlocking notch for receiving the inner edge of the locking bar at the outer edge of the free end are arranged along the key hole. Each of these tumbler groups engaged with the corresponding keyway of the key inserted through the keyhole Can, in what unlocking notch of each lever tumbler is so aligned with the inner edge of the locking bar,
Each lever tumbler is a combination of a tumbler A and a tumbler B that overlap each other in a substantially C shape, and is supported so that it can rotate around the axis of an eccentric shaft that projects from both ends of the support shaft. The tumbler A, one end of which is loosely fitted to the support shaft, is formed with an engaging portion with the key groove of the key, and is biased in a direction that interferes with the key, and one end is rotated about the support shaft. Forming the unlocked notch on the outer edge of the free end portion of the tumbler B that is freely fitted, and forming the portion that overlaps with the engaging portion with the key side edge of the tumbler A so as not to interfere with the key, On the other hand, an engagement protrusion is provided on the inner edge of the tumbler A on the side facing the tumbler B, and an engagement protrusion of the tumbler A is formed on the inner edge of the tumbler B on an arc centering on the support shaft. A plurality of engaging recesses that can be engaged with each other, and When the engaging portion of the tumbler A is engaged with a plurality of types of key grooves formed at the side edge of the key, the angled position is set so as to be aligned with the engaging protrusion, The switch shaft is urged outward, and a switch member that can be moved in the radial direction of the inner cylinder and can be operated from the outside is provided at the inner end of the inner cylinder so as to be able to come into contact with it from the outside of the spindle. A variable lever tumbler tablet.

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